type: If T is a unsigned integer type then
the same type as T, if T is an signed integer type then the corresponding
unsigned type. Otherwise if T is an enumerated or character type (char or
wchar_t) then an unsigned integer type with the same width as T.

If T has any cv-qualifiers then these are also present on the result type.

Requires: T must be an integer or enumerated
type, and must not be the type bool.

C++ Standard Reference: 3.9.1.

Header:#include<boost/type_traits/make_unsigned.hpp>
or #include<boost/type_traits.hpp>